Abu Sa'id Ahmed ibn Mohammed ibn Abd al-Jalil al-Sijzi (c. 945 - c. 1020, also known as al-Sinjari and al-Sijazi; Persian: ابوسعید سجزی; Al-Sijzi is short for "Al-Sijistani") was an Iranian Muslim astronomer, mathematician, and astrologer. He is notable for his correspondence with Al-Biruni and for proposing that the Earth rotates around its axis in the 10th century.
He dedicated work to 'Adud al-Daula, who was probably his patron, and to the prince of Balkh. He also worked in Shiraz making astronomical observations from 969 to 970.
Al-Sijzi studied intersections of conic sections and circles. He replaced the old kinematical trisection of an angle by a purely geometric solution (intersection of a circle and an equilateral hyperbola.)
Al-Biruni tells us that Al-Sijzi invented an astrolabe, called "al-zūraqī", whose design was based on the idea that the Earth rotates:
Al-Biruni also referred to Al-Sijzi as a prominent astronomer who defended the theory that the earth rotates in al-Qānūn al-Masʿūdī.
You'll always miss my big old body
In its prime and never shoddy,
While bloodhounds wait down in the lobby you'll eulogize my big old body
You'll miss me with effigies
Lighting up your house like Xmas trees
As tears roll down below your knees
You'll miss me with effigies
Go find a man to fit my shoes
Left one's old and the right one's new
And I bought the right one just for you
Go find a man to fit my shoes
You'll see my teeth in the stars above
Every tree a finger of my glove
And every time push comes to shove
You'll see my teeth in the stars above
Your money talks but my genius walks
Morticians wait with a shovel and a fork
As detectives trace my hands with chalk
Your money talks but my genius walks
You'll miss me so
You will miss me
It must be raining because a man ain't supposed to cry
But I look up and I don't see a cloud